1. <u>Theresa and Mary</u> had such a great time at the party. 2. <u>Food and drinks</u> were free, even though we had to pay for the tickets to enter. A compound subject is one that contains more than one word. So, in both of these sentences, the subject consists of 2 nouns, which is why it is compound.
The correct answer is C. You would not use an R.A. number to replace a missing serial number. Serial numbers on products are not replaceable. Each serial number is assigned to that particular item and no other. It is that items identifying number.
